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Artículo
On some D-modules in dimension 2
(Cornell University, 2000)
We prove a duality formula for two D-modules arising from logarithmic derivations w.r.t. a plane curve. As an application we give a differential proof of a logarithmic comparison theorem in [4].
Artículo
The Size of a Graph Without Topological Complete Subgraphs
(2000)
In this note we show a new upperbound for the function ex(n;TKp), i.e., the maximum number of edges of a graph of order n not containing a subgraph homeomorphic to the complete graph of order p. Further, for ${\left \lceil ...
Artículo
Optimization methods for the planning of rapid transit systems
(Elsevier, 2000)
A central question when planning rapid transit systems is the determination of alignments and stations. Operational research methods can help solve these problems and they are also useful for the assessment of the network ...
Artículo
Cohomology of some Nilpotent Lie Algebras
(Universidad de Extremadura, 2000)
Artículo
A class of nilpotent lie algebras
(Taylor and Francis, 2000)
A p-filiform Lie algebra g is a nilpotent Lie algebra for which Goze’s invariant is (n–p,1,…,1). These Lie algebras are well known for P ≥ n-4n = dim(g). In this paper we describe the p-filiform Lie algebras, for p = n-5 ...
Artículo
Seudosuperficies y economía
(2000)